如何取消查看列表中选中的项目

我试过了:

    foreach (ListViewItem item in lvPC.CheckedItems)
    {
        selectedTag = item.Tag.ToString();
        DialogResult result = MessageBox.Show
            ("Are you sure you want to remove this entry?",
            "Information", MessageBoxButtons.YesNo,
            MessageBoxIcon.Information);
        if (result == DialogResult.Yes)
        {
            // SQL query which will delete entry by using entry ID.
            string sql = "DELETE FROM PersonalData WHERE DataID = " + selectedTag;
            DeleteData(sql, selectedTag);
            DisplayFileContent(filePath);
        }
        else
        {
            if (lvPC.CheckedItems == CheckState.Checked)
                item = CheckState.Unchecked;
        }
    }

但显然我不知道该怎么做。我如何检查我的物品状态?如何取消勾选?

else
{
    item.Checked = false;
}